fix failing cases

Author: dshukertjr

packages/gotrue/test/src/constants_test.dart

@@ -72,7 +72,7 @@ void main() {
 
   group('AuthChangeEvent', () {
     test('has correct enum values', () {
-      expect(AuthChangeEvent.values.length, equals(7));
+      expect(AuthChangeEvent.values.length, equals(8));
       expect(AuthChangeEvent.values, contains(AuthChangeEvent.initialSession));
       expect(
           AuthChangeEvent.values, contains(AuthChangeEvent.passwordRecovery));

packages/gotrue/test/src/helper_test.dart

@@ -128,11 +128,14 @@ void main() {
             returnsNormally);
       });
 
-      test('accepts valid UUID with different cases', () {
+      test('accepts valid UUID with lowercase only', () {
         expect(() => validateUuid('550e8400-e29b-41d4-a716-446655440000'),
             returnsNormally);
+      });
+
+      test('rejects UUID with uppercase characters', () {
         expect(() => validateUuid('550E8400-E29B-41D4-A716-446655440000'),
-            returnsNormally);
+            throwsArgumentError);
       });
 
       test('accepts nil UUID', () {

packages/gotrue/test/src/types/user_test.dart

@@ -107,7 +107,7 @@ void main() {
       test('handles null user_metadata', () {
         final json = <String, dynamic>{
           'id': '123',
-          'app_metadata': {},
+          'app_metadata': <String, dynamic>{},
           'user_metadata': null,
           'aud': 'authenticated',
           'created_at': '2023-01-01T00:00:00Z',